>>12249766Just because it wouldn't lead to a paradox doesn't mean that there's a viable mechanism for retrocausality/backwards time travel allowed within the framework of the many-worlds interpretation. If there is, I don't yet know of it.
To contrast, there is a physical mechanism for the violation of causality in the copenhagen interpretation. That is, when two entangled spin states are measured across a spacelike interval, you can't properly say which measurement "caused" the collapse.
Many worlds interpretation does have a great explanation for this: that, by measuring, both experimenters entangle themselves with their particles as well as the particle across the spacelike interval, splitting the universe. The experimenters will find themselves in worlds where the particle far away is in the state that the measurement of the particle close by would imply. Thier observation doesn't change the quantum state, it just entangles the state with the experimenters. Since their observation doesn't directly change the entangled state, there's no faster than light communication, and therefore no violation of causality! Hooray for MWI!
Hopefully that was a semi-coherent explanation.
